. >> there could be a shake-up at the capital, a state senator is calling on governor brown to change the leadership at the public utilities commission, the move follows our investigative unit report last night, uncovering a confidential internal document raising questions about the commitment to safety. >>> chief investigateive reporter joins us from sacramento. tony, it's a big show down, what do you expect tomorrow? >> tensions clearly building here between the state lawmakers and the public utilities commission. today the head of the san bruno senator sa -- senator said he wants the govern, governor brown to call for the president of the puc to step down. >> oh, my god, that is crazy. >> we have a fire ball. still coming out. >> safety is by far their most important responsibility. and they have neglected that responsibility and it's indicated by this report and what we we saw in san bruno. >> this report and years of frustration dealing with the puc, the senator said it's time to change. >> good people lost their lives because an explosion that did not have to occur. the governor